GHOSH, D.; SRIVASTAVA, P. D. Generalized sequence space ${F(X,r)}$. Tamkang Journal of Mathematics, [S. l.], v. 34, n. 2, p. 93–98, 2003. DOI: 10.5556/j.tkjm.34.2003.255. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/255. Acesso em: 5 may. 2024.